On occasion, I have written a post, hit send, and gotten a message "no post mode specified" and the post disappears. Pretty frustrating after crafting a long and brilliant exposition. Is this problem caused from my end, or is it a PN problem? I fear it may be something to do with my computer, but other posts work fine, so I don't know where to look for solutions.

Actually, the same thing has happened to me. Sometimes it's while I'm composing a brilliant and convoluted piece on some critical subject over the course of an hour or more.

I think what's happening is that when you start composing, your editing is time limited if you don't press send (or preview). I think Forumotion just assumes you closed your window and went away. Then when you finally do send something, Forumotion has forgotten you were editing.

Indeed it is, but I'm about 90% sure there is some sort of "time out" default setting with the forum servers so we have to jump through that hoop continually... Well unless we had our own server/hosting agent but I'm not going to suggest we cut into the Geez's Pliny/flat screen/fur lined seating budget....